Create synchronized store for user information

[fractalwrench]

Goal

Creates a synchronized store which is used for reading & writing user information. This replaces SharedPreferences which is not safe for use in a multi process environment, and does not give control over the location where information is persisted.

Changeset

• Created SynchronizedStreamableStore, which is capable of reading and writing Streamable objects
• Synchronized access to the persist() and load() methods with a ReentrantReadWriteLock so that concurrent reads of the information is possible when the file is not being written
• Added method to allow deserialization of User, along with JsonReadable interface

Testing

Created instrumentation tests which verify that data can be persisted and loaded, and that the read lock allows concurrent access.

[bugsnagbot]

Android notifier sizes

Format	Size impact of Bugsnag (kB)	Size impact of Bugsnag when Minified (kB)
APK	1442.35	1361.31
arm64_v8a	369.25	287.32
armeabi	348.76	266.85
armeabi_v7a	332.39	250.47
x86	410.2	328.27
x86_64	393.81	307.81

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